Brake-operating mechanism



Nov., 24A 1925- BRAKE OPERATING MECHANI SM Filed oct. s'.

throughout the greater portion. of theirv length, parallel with andadjacent the beams, as best shown in Fig. 1. 'lhc cables also extend.within spaced guides 11, secured to the frame, and between whichconnection of the cables with the control mechanism is.

made, as will later be more fully described. 12 designates what may bethe engine of the'vehicle and 13 the transmission case or housingwherein the transmission shaft 14 and the speed changing Vgears arecontained.

The driving shalt leextends rearwardly from shaft lll to an operativeconnection, through axle 4, with the rear or driving wheels. The mannerof making this connection, as well as the design ot the engine andtransmission case is immaterial and need no further description.

Secured to the transmission shaft 14, preferably at a point. just backof the transmission housing, is a drum 16-l about which a tric-tion band17 is-floatingly fitted. .The drum yis rotatable within the band' andthe band is held functionally between flangesl 18 and 19 at oppositeedges of the drum. The band is made of flexible material, preferablyspring steel, that is shaped to conform to the curvature of the drumandisprovided, on its inner surface, with a suitable lining, It does notentirely encircle the drum and its two ends 'are disposed in spacedrelation normally at the top of the drum, as shown Ain Fig.

Secured to the opposite sides otth'e band are brackets 20 and 21 towhich are. attached 'the ends of a cable 22 that extends over guides 23fixed to the band adjacent its ends, and at its centerover a pulleywheel 24 that is mounted. at the end of a lever arm 25,A which by means,as presently described, may

be moved upwardly to cause tension to be exerted on the band whereby thelatter will be tightened against the drum so that it will tend to rotatetherewith.

The lever arm 25, at its inner end, is rotatable on a si-ipporting shaft26 that is mounted at its opposite ends iu standards 27 that are fixedupon thehousing 13, or any lined stationary part of the' vehicle frame.At one end ot' this shaft is a rotatably mounted' lever arm 2S providedwith a shoulder 29 adapted to ez'igage witlnan opposing shoulder 30 onthe lever 25. The outer end of the lever 28 connected h v means of alink 31 with a. pivotally moimted toot pedal 32 wl'lich, when depressed,will effect pivotal movement ot levers 28 and upto cause a tighteningol" the band 17 about the drum. A like .movement of the lever 25 may bereffected by rearward movement of an emergency lever 33 that is pivotallysupported from the side of the housing 13 opposite pedal 32, and whichis connected by means of a link 34 with a lever 35 on the end 01"' theshaft 26 opposite lever 28 and which has a.sl1onlder 36 adapted forengagement with a shoulder 87 on the arm 25. As will be seen in Fig. 6,there is a portion cut away from thc lever 35, as at 38, to leave spacefor braking movement of lever 25 by the foot pedal without effectingmovement ot' the emergency lever. This arrangement is also provided forin the construction of lever 28 so that operation by means of theen'iergency brake will not be opposed.

Mounted on the brackets 2O and 21 are paired vertically spaced guiderollers 40 and adjacent Vthereto in horizontal alinement are paired,similarly spaced guide rollers 41 that are mounted on brackets 42fastened to the opposite sides of the housing 13, or to a lixed memberin the vehicle frame.

yExtended about the lower portion of the band 1 7, over a plurality ofguide rollers 43 mounted on the latter, is a taut cable 45, the endportions of which are extended between the paired guide rollers 40 and41 at opposite sides of the drum1 and tothese ends are attached pulleys46 which are mounted on the cables 8 and 9 between the guides 11.

It will be stated here that the wheel brakes are of the conventionaltype commonly used and the-brake shoes of the several drums on,

the wheels are equipped with springs whereby they are normally helddisengaged from the drums, and that these springs, acting on the leverarms 7, retain the cables 8 and 9 taut. These latter cables likewiseretain cablee ydrawn taut and this, while not positively connected withthe band 17, retains it in neutralposition, as is shown in Fig. 3.Should the springs of the brake mechanism prove to be insullicientadditional springs for the above purpose are attachedto fixed arts ofthe vehicle and to the band 17 and) to the cable 45 at opposite sides ofthe drum as is designated in Fig. 4.

Assuming the parts tol be so constructed and assembled as described, theoperation would be as follows:

With the-vehicle in motion. either 'tor- .ward or backward, should it bedesired io apply the brakes, 'the'di'iver depresses the 'toot pedal 32,thereby rotating lever 28 to swing lever 25 upwardly. rlhis moven'ient.tightens the cable 22 and draws the band 17 against the drum 16 so thatthe band, due toV frictional Contact, tends to rotate with the drum.Should the vehiclebe moving fornuird, the band 17 will be movedtrom:neutral position. as shown in Fig. Il, toward the position as shown inFig. el, or it in re- 'versc gear., it lnoves toward position as shownin Fig. 5, thereby causing the paired rollers 4() to move radially fromhorizontal alineinent 'with paired rollers 4l. to cause a more extendedWrapping of cable 45 about the band and drum and consequently e'lr-owing in of its ends and the tightening and drawing in ot' cables 8and 9; these latter cables, being connected with brake arms- T, willcause the brakes to be applied... .lt is apparent also that a likemovement will l take place by operating' the emergency le.-

. ,cuide rollers 25% at Al l) ver und that the action is the samewhether the vehicle is moving forward vor rearward.

lt is to be noted that an equalization of braking; forces as applied Ytoall brakes is obtained by this construction or the reason.

ll., will effect on equal application` of brakf ine; pressure by thebrakes Vwith which they connect.

The full length of the, friction-al surface or the hand l? is retainedin functional relation to the` dri :n during a braking opera' tion .forthe reason that, when the band is rotatably advanced in eitherdirectiong' the its ends are wedged he heath the cable 29vsee Figs. 4and 5, and the tendency of the band to rotate increases its pressureagaiist the-drum and causes a greater tightening of the braking eonnec?tions. Therefore, the braking pressure varies in accordance with thetension applied through cable 22. I I

When pressure is released froxn the foot pedal, Aor emergency lever, thereleasing Springs in the brake drunisfand springs 35 act through. thecables to draw band 17 and operating members back to neutral position.

.ln order that the danger of accidents be :l a minimum, due to` possibleretety stops 50 have been fixed to the l at opposite sides of the drum,so unid either'cable 8 or 9 break, the stop t iat side will engage withthe adjacent oeired. rollers 41 to limit movement of ihr cable and tothereby insure a continued Functioning ot the other cable and brakeswith which it is connected.

Breite actuating means, as above described, can be made, by properconnection, to noterete 'the brakes singly, in airs. or in variouscombinations as may e desired, thus providing for the application ofbrak ing; "pressure on some Wheels in advance of others and tor o..variation of braking pressure upon the different brake drums.

While tbecable l5 is A:shown to be ooo- -wheel brakes of liant. andheavy no' of cable at either side of the ve-A nected to actuale thewheel braltes through cablcs'tl and 9, it :is to he understood thatother means of connection could he employed and that the mechanism iealso op rcalffle to vehicles with brakes on but two wheels.

lt is also to be understood that instead. o lz Cables 2Q and :l5 otherineens oi connection, such as chains, tapes, ropes etc. could be used,also that rods, chains etc. vcould be utilized inplace of cables S andil und these connected through suitable eoualizers with the brake arms.

Further be it understood that, While a, specific `hand lever and lootpedal control and mechanism connected therewith has been described andillsistrated` it is not iutended to be confined to this, it is apparentthat different constructions could, or would be employed to suit theparticular ydesign of the vehicle equipped withv this braking system.

From the foregoing description can be seen that, While it requires but a.slight pressure on the vfoot pedal or a light pull on the hand lever toengege 'the bend 'il with the drum 16, the braking" torce derived fromthe momentum oitbe vehicle is relatively great and :nay be iaried inaccordance with the force applied through the hond lever-or foot. pedal,thus 'there may be converted from the inertial oft the rushicle a forcenl' ample capacity or the operation tout Withoutv loss ot' enciencythrough the die tribution of the braking power.

1t is further apparent, that mechanism functions with equal eliectiveness` on either forward or reverse speeds and the operation isuninfected ny spring derlei tion, elongation of the cables and weer ngithe Wheel braking' members, l

Having thus described my intention, what claim as new therein, anddesire to secure by Letters Patent is:

1. ln a vehicle oli the class described, a braking mechanism, arot-otabljv driven member, a contactznrember adapted to be rictionallyVengaged with said rotatably driven member and to be moved by suchContact, a `guide on the Said contact inelnber, a stationary gruideand.a ilexible ber extended through said guides und. haw ing operativeconnection withjthe braking mechanism whereby' the latter will beactuated by rotatire movement or' the control member in eitherdirection.

2. ln a vehicle of the class described, han? vehicles,Vv

this type oiltlli .ing braking mechanisms at opposite sides, a

rotatably 'driven drum, a segmental bend d1sposed loosely about thedrum, guide rnenn bers on the band., e flexible member entf-3nd-Y edthrough the guide members and connected at its ends with the brakingmechanisms, and means *for drawing the segmental band into frictionalcontent with the drum to et ble member and the actuation ofthe brakingmechanisms.

3. InI a vehicle of the class described havJv ing braking mechanisms atopposite sides,

` with the shaft, a yieldable band partlv a rotatably driven drum, asegmental bandv disposed loosely about'the drum, guide members on theband, stationary guides at the opposite sides of'the drum, aflexiblemembei'y extended slidabl)-` through the' guide members on the band andsaid stationary guides and connected at its opposite ends with thebraking mechanisms at opposite sides,

and means for moving the band into frictional contact with the drum toelect rotative movement of the band and a resultant draivinY iii'oltheends of the fiexible member an an equal application therethrough ofbraking forces to the braking mechanisms with which the ends of theflexible member connect. 1 A I 4. In'a vehicle of the class describedhaving wheel braking mechanisms, a rotatably. driven drum, a segmentalband disposed loosely about the drum, guide members on the band, meansfor drawing the band into frictional contact with the drum to effectrotative movement thereof, a exible member extended throu h the guidemembers of the band operatively connected at its ends for actuating thebrake mechanisms upon rotative movement of the band, and providing for areaction between the brakes and an equal distribution of the appliedforce to the brake mechanisms.

5. In a vehicle of the class described equipped with wheel braking meansat opposite sides, a rotatable shaft having driving connection with thevehicle wheels, a drum rotatable with the shaft, a yieldable band partlyencircling the drum, guide members on the band, a pivotally movablelever, a cable connectedwith said band and having operative connectionwith said lever, manual control means for actuating the lever to causesaid band to be drawn by said cable into frictional engagement with thedrum to thereby effect rotative movement of the band with the drum and aflexible member having operative connections at its endswith thebrakemechanisms at oppositeV sides of the vehicle andthrough which thelatter are actuated by rotative movement of the band.

6. In a vehicle of the class described, having braking means at itsopposite sides, a rotatable shaft having driving connection with thevehicle wheels, a drum rotatable encircling'the drum, a pivotallymovable ever, a cable connected with said band and having operativeconnection with said lever,-

manual control means for actuating the lever to Acause said band to bedrawn by said cable into frictional engagement with the drum to therebycfect rotative movement of the band with the drum, a cable connected atits ends with the brake actuating means and having va connectionintermediate its ends with the said band whereby krotative movement ofthe band in either-direction eii'ects actuation of thel brakingmechanism.

7. Ina vehicle of the class described, having braking mens4 at itsopposite sides, a

rotatable shaft iaving driving connection .with-the vehicle wheels, adrum rotatable .with the shaft, a yieldable band partly encirclingthedrum, a pivotally movable lever, a cable connected with said band andhaving operative connection with said lever, manual contiol means foractuating the lever to cause ysaidjband vvtobe drawn b said cable intofrictional engagement witi the drum to thereby efl'cct rotative movementof the Bti bandwith-the drum, a cable connected at ite` 55 ends with thebrake actuatin means and havin axconnection intermediate its `ends 'withtie said band whereby rotative movement of the band in either directioneffects actuation of the braking mechanism, and yieldable means formoving the band and associated parts back to neutral position yupon,release of the control means.

rollers, a cable extended partly about the band in disconnected relationthereto and between said paired rollers and having'operative connectionat its ends with the brake actuating means at opposite sides of thevehicle, manually operable means for actuating the band into frictionalcontact with the drum to'cause rotative movement of the band whereb theends` of said cable are dravn inan the braking mechanism actuate t 9. Ina vehicle having wheel braking mechanism at its opposite sides, arotatable shaft having driving connection with said wheels, a drumrotatable with said shata yieldable friction band disposed about thedrum, guide rollers fixed in paired relation on the band at, oppositesides of thc drum.. pairedguide rollers supported from a fixed memberadjacent to the rst named rollers, guide rollcis mounted `,on thebandbetween the paired rollers, a cable extended over the' cause the band toendently operable hand or actuating the lever to be drawn into rietionalContact with the drum. l.' i

10. A meehanism as set forth in claim' 6 whereinmeans (50) is providedfor limiting movement of the last named cable in opposite directions. I

11. A meehanismasrecited in` claim 6 wherein there are guides (41) forthe last named cable mounted on a xed member ,at opposite sides of thedrum and stop memthe cable and inde.

and foot controls hers (50) are fixed to the cable and adapted toenga'ge'witli said guides for the purpose set forth. l

12.111 a vehicle of the class described equipped with wheel'braking.means7 a rotatable shaft having driving connection with shaft,a friction the vehicle wheels,

band applied about the drum, a pivotall movable lever, a cable eX-tended over SaidY lever and connected at its ends to the band at opositesides of the drum, manually operab e means for actuating the lever totension the band to be drawn engagement with the drum to effect rotativemovement ofthe band, and rollers (23) Xed to said band vand adapted, bysuch rotative movement, to be'moved into wedging Contact withythetensioning cable to cause a further tightening of the band against thedrum'.

,Signed at Seattle, Wash., this 29 day of September, 1923.

the cable tocause GEORGE D. HUGO.

a drum rotative with the 25 thereby into frietional..

